<template>
  <div class="case-display-container">
    <!-- 页面头部 -->
    <div class="page-header">
      <h1 class="page-title">优秀案例展示</h1>
      <p class="page-subtitle">探索创新解决方案与成功实践</p>
    </div>

    <!-- 搜索区域 -->
    <div class="search-section">
      <div class="search-wrapper">
        <el-input
          v-model="searchQuery"
          placeholder="请输入关键词搜索案例..."
          clearable
          size="large"
          class="search-input"
        >
          <template #prefix>
            <i class="el-icon-search prefix-icon"></i>
          </template>
        </el-input>
        <el-button type="primary" @click="searchCases" class="search-button">
          搜索案例
        </el-button>
      </div>
    </div>

    <!-- 筛选和排序 -->
    <div class="filter-section">
      <div class="filter-wrapper">
        <el-radio-group v-model="sortType" size="small">
          <el-radio-button label="latest">最新发布</el-radio-button>
          <el-radio-button label="name">名称排序</el-radio-button>
        </el-radio-group>
        <div class="result-count">
          共 <strong>{{ filteredCases.length }}</strong> 个案例
        </div>
      </div>
    </div>

    <!-- 案例列表区域 -->
    <div class="case-grid">
      <el-card
        v-for="(caseItem, index) in sortedCases"
        :key="index"
        class="case-card"
        shadow="hover"
        @click="goToDetails(caseItem)"
      >
        <div class="card-badge" v-if="index < 3">推荐</div>
        <template #header>
          <div class="card-header">
            <img :src="caseItem.img" alt="案例图片" class="case-image" />
            <div class="case-overlay">
              <div class="overlay-content">
                <el-button
                  type="text"
                  icon="el-icon-view"
                  class="quick-view-btn"
                >
                  快速预览
                </el-button>
              </div>
            </div>
          </div>
        </template>
        <div class="case-info">
          <div class="case-title">{{ caseItem.title }}</div>
          <div class="case-tags">
            <el-tag
              size="mini"
              v-for="tag in getTags(caseItem.content)"
              :key="tag"
              >{{ tag }}</el-tag
            >
          </div>
          <div class="case-content">{{ caseItem.content }}</div>
        </div>
        <div class="case-footer">
          <div class="case-meta">
            <span class="create-time"
              ><i class="el-icon-date"></i> {{ caseItem.create_time }}</span
            >
            <span class="view-count"
              ><i class="el-icon-view"></i> 248 次浏览</span
            >
          </div>
          <el-button type="primary" size="small" class="view-details-btn">
            查看详情
          </el-button>
        </div>
      </el-card>
    </div>

    <!-- 无结果提示 -->
    <div v-if="showNoResult" class="no-result-message">
      <el-empty description="未找到匹配的案例" image="empty">
        <template #bottom>
          <el-button type="primary" @click="resetSearch">
            清除搜索条件
          </el-button>
        </template>
      </el-empty>
    </div>

    <!-- 分页控件 -->
    <div class="pagination-section" v-if="!showNoResult">
      <el-pagination
        background
        layout="prev, pager, next"
        :total="filteredCases.length"
        :page-size="8"
        @size-change="handleSizeChange"
        @current-change="handleCurrentChange"
      >
      </el-pagination>
    </div>
  </div>
</template>

<script setup>
import { ref, reactive, onMounted, computed } from "vue";
import {
  ElMessage,
  ElCard,
  ElInput,
  ElButton,
  ElEmpty,
  ElPagination,
  ElRadioGroup,
  ElRadioButton,
  ElTag,
} from "element-plus";
import { useRouter } from "vue-router";

// 导入案例图片
import caseImg1 from "@/assets/t1.jpg";
import caseImg2 from "@/assets/t2.jpg";
import caseImg3 from "@/assets/t3.jpg";
import caseImg4 from "@/assets/t4.jpg";

const router = useRouter();

// 搜索和筛选相关数据
const searchQuery = ref("");
const sortType = ref("latest");
const currentPage = ref(1);
const pageSize = ref(8);

// 案例数据
const originalCases = reactive([
  {
    title: "优秀案例1",
    img: caseImg1,
    create_time: "2024-10-23",
    content: "康院优秀案例收集与分享平台（学生端）",
    tags: ["学生平台", "数据收集", "分享系统"],
  },
  {
    title: "优秀案例2",
    img: caseImg2,
    create_time: "2024-10-22",
    content: "基于vue及可视化技术的阿尔兹海默症可视化大屏",
    tags: ["数据可视化", "医疗健康", "大屏展示"],
  },
  {
    title: "优秀案例3",
    img: caseImg3,
    create_time: "2024-10-21",
    content: "基于VUE的学生个人画像网",
    tags: ["学生画像", "数据分析", "教育技术"],
  },
  {
    title: "优秀案例4",
    img: caseImg4,
    create_time: "2024-10-20",
    content: "康院优秀案例收集与分享平台（教师端）",
    tags: ["教师平台", "案例管理", "教育资源"],
  },
]);

// 计算属性：过滤后的案例列表
const filteredCases = computed(() => {
  if (!searchQuery.value.trim()) {
    return originalCases;
  }

  const query = searchQuery.value.trim().toLowerCase();
  return originalCases.filter(
    (caseItem) =>
      caseItem.title.toLowerCase().includes(query) ||
      caseItem.content.toLowerCase().includes(query)
  );
});

// 计算属性：排序后的案例列表
const sortedCases = computed(() => {
  const cases = [...filteredCases.value];

  if (sortType.value === "latest") {
    return cases.sort(
      (a, b) => new Date(b.create_time) - new Date(a.create_time)
    );
  } else if (sortType.value === "name") {
    return cases.sort((a, b) => a.title.localeCompare(b.title));
  }

  return cases;
});

// 计算属性：当前页显示的案例
const paginatedCases = computed(() => {
  const start = (currentPage.value - 1) * pageSize.value;
  const end = start + pageSize.value;
  return sortedCases.value.slice(start, end);
});

// 是否显示无结果提示
const showNoResult = computed(
  () => searchQuery.value.trim() && filteredCases.value.length === 0
);

// 从内容中提取标签
const getTags = (content) => {
  const tags = [];
  if (content.includes("学生")) tags.push("学生");
  if (content.includes("平台")) tags.push("平台");
  if (content.includes("数据")) tags.push("数据");
  if (content.includes("可视化")) tags.push("可视化");
  if (content.includes("教师")) tags.push("教师");
  return tags;
};

// 搜索功能
const searchCases = () => {
  if (searchQuery.value.trim()) {
    currentPage.value = 1; // 重置页码
  } else {
    resetSearch();
  }
};

// 重置搜索
const resetSearch = () => {
  searchQuery.value = "";
  currentPage.value = 1;
};

// 跳转到详情页
const goToDetails = (caseItem) => {
  if (caseItem.title === "优秀案例1") {
    router.push("/error");
  } else {
    router.push({
      path: "/Details",
      query: caseItem,
    });
  }
};

// 分页相关方法
const handleSizeChange = (newSize) => {
  pageSize.value = newSize;
};

const handleCurrentChange = (newPage) => {
  currentPage.value = newPage;
};

// 页面加载时的初始化
onMounted(() => {
  // 添加页面进入动画
  const container = document.querySelector(".case-display-container");
  if (container) {
    container.classList.add("fade-in");
  }
});
</script>

<style scoped>
/* 基础样式 */
.case-display-container {
  max-width: 1360px;
  margin: 0 auto;
  padding: 30px 20px;
  opacity: 0;
  animation: fadeIn 0.5s ease-in-out forwards;
}

/* 页面头部样式 */
.page-header {
  text-align: center;
  margin-bottom: 40px;
}

.page-title {
  font-size: 28px;
  font-weight: 600;
  color: #303133;
  margin-bottom: 10px;
}

.page-subtitle {
  font-size: 16px;
  color: #606266;
}

/* 搜索区域样式 */
.search-section {
  padding: 25px 0;
  background-color: #f9fafc;
  border-radius: 16px;
  margin-bottom: 30px;
}

.search-wrapper {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  gap: 15px;
}

.search-input {
  flex: 1;
  border-radius: 30px;
  overflow: hidden;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
}

.prefix-icon {
  color: #909399;
  margin-left: 15px;
}

.search-button {
  border-radius: 30px;
  background-color: #279c55;
  border-color: #279c55;
  transition: all 0.3s;
  padding: 0 30px;
  font-weight: 500;
}

.search-button:hover {
  background-color: #1e7d44;
  border-color: #1e7d44;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(39, 156, 85, 0.2);
}

/* 筛选区域样式 */
.filter-section {
  margin-bottom: 25px;
}

.filter-wrapper {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.result-count {
  color: #606266;
  font-size: 14px;
}

/* 案例卡片样式 */
.case-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 28px;
}

.case-card {
  border-radius: 16px;
  overflow: hidden;
  transition: all 0.3s ease;
  cursor: pointer;
  border: none;
  position: relative;
}

.case-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
}

.card-badge {
  position: absolute;
  top: 15px;
  left: 15px;
  background-color: #ff7d00;
  color: white;
  font-size: 12px;
  font-weight: 500;
  padding: 3px 8px;
  border-radius: 4px;
  z-index: 10;
}

.card-header {
  padding: 0;
  height: 220px;
  overflow: hidden;
  position: relative;
}

.case-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.case-card:hover .case-image {
  transform: scale(1.08);
}

.case-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.6);
  opacity: 0;
  transition: opacity 0.3s ease;
  display: flex;
  justify-content: center;
  align-items: center;
}

.case-card:hover .case-overlay {
  opacity: 1;
}

.quick-view-btn {
  color: white;
  font-size: 14px;
  background-color: rgba(255, 255, 255, 0.2);
  padding: 8px 16px;
  border-radius: 4px;
  transition: all 0.3s;
}

.quick-view-btn:hover {
  background-color: rgba(255, 255, 255, 0.3);
  transform: translateY(-2px);
}

.case-info {
  padding: 20px;
}

.case-title {
  font-size: 20px;
  font-weight: 600;
  color: #303133;
  margin-bottom: 12px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.case-tags {
  margin-bottom: 15px;
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
}

.case-tags .el-tag {
  background-color: #f2f3f5;
  color: #606266;
  border: none;
}

.case-content {
  font-size: 14px;
  color: #606266;
  line-height: 1.7;
  max-height: 68px;
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  margin-bottom: 20px;
}

.case-footer {
  padding: 0 20px 20px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.case-meta {
  display: flex;
  gap: 15px;
  color: #909399;
  font-size: 13px;
}

.case-meta span {
  display: flex;
  align-items: center;
  gap: 5px;
}

.view-details-btn {
  background-color: #279c55;
  border-color: #279c55;
  color: white;
  border-radius: 4px;
  padding: 6px 15px;
  transition: all 0.3s;
}

.view-details-btn:hover {
  background-color: #1e7d44;
  border-color: #1e7d44;
  transform: translateY(-1px);
}

/* 无结果提示样式 */
.no-result-message {
  padding: 80px 0;
}

/* 分页控件样式 */
.pagination-section {
  margin-top: 40px;
  display: flex;
  justify-content: center;
}

/* 动画效果 */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
</style>  